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I can understand "partisan" as someone whose primary adherence is loyalty to a party and will comply with the latest party talking points. I don't know what a "weathervane" is.

Weathervanes point in the direction of the prevailing wind.

You could call them trendies, or in cybercultural terms: NPC, I SUPPORT THE CURRENT THING, etc

Weathervanes reorient themselves based on the direction the wind is blowing.

I took this to mean: “weathervanes” are people who attach themselves to some popular sentiment without giving it much thought.

Wouldn't partisans fall under the dogmatists?

Dogmatism is more about ideas and ideologies, while partisanship is more about in-groups and out-groups.

Dogma is -- by its very denotation -- inflexible. Partisans have no issue with flexibility.

Don’t the weathervanes oscillate?